Learning Spanish is another one... or if not Spanish, French, German, Japanese, etc. A foreign exchange student in high school told me a joke that goes:
What do you call someone who speaks three languages? Tri-Lingual
What do you call someone who speaks two languages? Bi-Lingual
What do you call someone who speaks one language? American
I've heard that one many times... and usually from UK-landers! (They hate being called that, by the way.

)
But just some further food for thought on the language barrier; I was a Russian linguist in the Air Force. (Actually, they started me off with Korean, but my system generated too many anti-bodies, and it was rejected by my brain.) But after 47 weeks of intensive training, my language level was about where the average 4-year college course would have been. Basically, that should illustrate the effort required to reach level 2 (on a scale of 0 to 5) on the
Defense Language Proficiency Tests:
* Reading: sufficient comprehension to read simple, authentic written material in a form equivalent to usual printing or typescript on subjects within a familiar context
* Listening: sufficient comprehension to understand conversations on routine social demands and limited job requirements.
So, my point: it takes a tremendous effort to acquire even rudimentary language skills.
Factor in the trouble most Americans have with *listening*, and "furr'ners" are even more at a disadvantage. I've worked with/studied with people from Guyana and India who were constantly teased or treated with hostility because of their accents. "Mr. Singh" was Guyanese, and people would yell at him "why don't you learn English better?" -- which was cruelly ironic from a grammar standpoint... but also cruelly ironic because English was his only language. Guyana and India are both English-speaking countries.
Of course, I seem to be preaching to the choir here... but I never seem to be in a position to answer the ignorant when they rear up their empty heads.